JP4761890B2 - Transmission rate control method, radio base station, and radio network controller - Google Patents

Description

  The present invention relates to a transmission rate control method for controlling the transmission rate of uplink user data transmitted from a mobile station via an enhanced dedicated physical data channel, and to a radio base station and a radio network controller used in the transmission rate control method. .

  In the conventional mobile communication system, when the radio network controller RNC sets a dedicated physical channel (DPCH) between the mobile station UE and the radio base station NodeB, the radio base station RNC receives the radio base station NodeB. Hardware resources (hereinafter referred to as hardware resources), uplink radio resources (uplink interference amount), transmission power of the mobile station UE, transmission processing performance of the mobile station UE, and transmission rate required by a higher-level application In view of the above, it is configured to determine the transmission rate of the uplink user data and notify the mobile station UE and the radio base station NodeB as a layer 3 (Radio Resource Control layer) message. .

  Here, the radio network controller RNC is an apparatus that exists above the radio base station NodeB and controls the radio base station NodeB and the mobile station UE.

  On the other hand, in data communication, traffic often occurs in bursts as compared to voice calls and TV calls, and it is originally desirable that the transmission rate of uplink user data can be changed at high speed.

  However, as shown in FIG. 19, in the conventional mobile communication system, the radio network controller RNC usually controls and controls many radio base stations Node B, and the processing load and processing in the radio network controller RNC are controlled. Since the delay is assumed to increase, there is a problem that it is difficult to perform high-speed (for example, about 1 to 100 ms) uplink user data transmission rate change control.

  Alternatively, in the conventional mobile communication system, even if the high-speed uplink user data transmission rate change control can be performed, there is a problem that the device mounting cost and the network operation cost are significantly increased.

  Therefore, in a conventional mobile communication system, it is usual to perform change control of the transmission rate of uplink user data on the order of several hundred ms to several s seconds.

  Therefore, in the conventional mobile communication system, as shown in FIG. 20A, when performing bursty data transmission, as shown in FIG. 20B, low speed, high delay, and low transmission efficiency are allowed. As shown in FIG. 20 (c), radio resources for high-speed communication are secured, and idle radio band resources and hardware resources in the radio base station NodeB are wasted. Data is transmitted with permission.

  However, in FIG. 20, it is assumed that both the above-described radio band resource and hardware resource are applied to the uplink radio resource on the vertical axis.

  Therefore, in “3GPP” and “3GPP2”, which are international standardization organizations of the third generation mobile communication system, in order to effectively use uplink radio resources, the layer 1 and the MAC sublayer between the radio base station NodeB and the mobile station UE High-speed uplink radio resource control methods in (Layer 2) have been studied. Hereinafter, such a study or a function that has been studied will be collectively referred to as an “uplink enhancement (EUL)”.

  A mobile communication system to which uplink enhancement is applied will be described with reference to FIG. In the example of FIG. 21, the cell # 1 managed by the radio base station NodeB is a serving cell of the mobile station UE # 1 that mainly controls the transmission rate of uplink user data transmitted by the mobile station UE # 1. In addition, cell # 1 managed by the radio base station NodeB is not the serving cell of the mobile station UE # 2, but is not the mobile station UE # 2 in which a radio link is established with the mobile station UE # 2. It is a serving cell.

  In such a mobile communication system, the cell # 1 transmits an E-AGCH (absolute transmission rate control channel) for transmitting the absolute transmission rate of the uplink user data to the mobile station UE1. It is configured to transmit E-RGCH (Relative Transmission Rate Control Channel: Enhanced Relative Grant Channel) for transmitting the relative transmission rate (UP command or DOWN command) of the uplink user data to the mobile station UE # 2. Is configured to do.

  In the mobile communication system, the mobile stations UE # 1 and UE # 2 are configured to transmit E-DPCCH (Enhanced Dedicated Physical Channel) and E-DPDCH (Enhanced Dedicated Physical Channel).

  Here, the radio base station NodeB causes the cell # 1 to serve as a serving mobile station (in the example of FIG. 21, a mobile station in order to suppress interference from a non-serving mobile station (in the example of FIG. 21, the mobile station UE # 2)). In order to suppress the ratio of the received power of E-DPDCH from UE # 1) and the received power (interference power) of E-DPDCH from non-serving mobile stations to a predetermined threshold or less, The “DOWN” command is transmitted by the E-RGCH.

  Note that the serving mobile station in cell # 1 indicates a mobile station that uses cell # 1 as a serving cell, and the non-serving mobile station in cell # 1 indicates a mobile station that does not use cell # 1 as a serving cell. .

That is, in such a mobile communication system, the MAC function implemented in the radio base station NodeB is configured to control the transmission rate of uplink user data in the mobile station UE using E-AGCH and E-RGCH. (See Non-Patent Document 1).
3GPP R2-05-0907

  However, in such a mobile communication system, the cell # 1 managed by the radio base station NodeB measures the received power of the E-DPDCH while the pattern of the uplink user data transmitted via the E-DPDCH is unknown. Therefore, a large measurement error may occur.

  Therefore, in such a mobile communication system, it is difficult to adjust the ratio between the received power of E-DPDCH from the serving mobile station and the received power of E-DPDCH from the non-serving mobile station in each cell due to the measurement error. Thus, there is a problem that the transmission efficiency is lowered.

  Therefore, the present invention has been made in view of the above points, and even when the uplink user data pattern is unknown, the received power of the E-DPDCH can be measured with a simple method with high accuracy. An object of the present invention is to provide a transmission rate control method, a radio base station, and a radio network controller that can be used.

  A first feature of the present invention is a transmission rate control method for controlling a transmission rate of uplink user data transmitted from a mobile station via an enhanced dedicated physical data channel, wherein the radio base station transmits from the mobile station. Measuring the received power of the dedicated physical control channel, and extracting the transmission data block size of the uplink user data from the enhanced dedicated physical control channel transmitted from the mobile station by the radio base station; The wireless base station acquires a transmission power ratio between the enhanced dedicated physical data channel and the dedicated physical control channel associated with the extracted transmission data block size, and the wireless base station has measured the Based on the received power of the dedicated physical control channel and the acquired transmission power ratio, the enhanced individual object Calculating a received power of the data channel; calculating a relative transmission rate of the uplink user data based on the calculated received power of the enhanced dedicated physical data channel; and A step of notifying the mobile station of the relative transmission rate of the uplink user data via a relative speed control channel, and the mobile station based on the notified relative transmission rate of the uplink user data, And a step of controlling a transmission rate of the uplink user data.

  In the first aspect of the present invention, in the step of calculating a relative transmission rate of the uplink user data, the radio base station is transmitted from a serving mobile station having a cell managed by the radio base station as a serving cell. An integrated value of received power of the enhanced dedicated physical data channel and an integrated value of received power of the enhanced dedicated physical data channel transmitted from a non-serving mobile station that does not use a cell managed by the radio base station as a serving cell. Based on the comparison result, the relative transmission rate of the uplink user data may be calculated.

  In the first aspect of the present invention, the radio base station stores a plurality of correspondence tables associating the transmission data block size with a transmission power ratio between the enhanced dedicated physical data channel and the dedicated physical control channel. The radio network controller notifies the radio base station of the identification information in the correspondence table when the mobile station sets up a data connection for transmitting the uplink user data, and acquires the transmission power ratio The enhanced dedicated physical data channel and the dedicated physical control channel associated with the transmission data block size extracted by referring to the correspondence table identified by the notified identification information in the wireless base station in the step The transmission power ratio may be acquired.

  A second feature of the present invention is a radio base station used in a mobile communication system that controls a transmission rate of uplink user data transmitted by a mobile station via an enhanced dedicated physical data channel, and transmitted from the mobile station. A measurement unit that measures received power of the dedicated physical control channel, a transmission data block size extraction unit that extracts a transmission data block size of the uplink user data from the enhanced dedicated physical control channel transmitted from the mobile station, and extraction A transmission power ratio acquisition unit that acquires a transmission power ratio between the enhanced dedicated physical data channel and the dedicated physical control channel associated with the transmitted data block size, and the measured received power of the dedicated physical control channel; Based on the acquired transmission power ratio, the enhanced individual physical data An enhanced dedicated physical data channel received power calculation unit that calculates received power of the channel, and an uplink user data relative transmission rate that calculates a relative transmission rate of the uplink user data based on the calculated received power of the enhanced dedicated physical data channel The gist of the invention is that it comprises a calculation unit and a relative rate control channel transmission unit that notifies the mobile station of the relative transmission rate of the uplink user data via a relative rate control channel.

  In the second aspect of the present invention, the uplink user data relative transmission rate calculation unit receives received power of the enhanced dedicated physical data channel transmitted from a serving mobile station having a cell managed by the radio base station as a serving cell. And the uplink user based on the comparison result of the received power of the enhanced dedicated physical data channel transmitted from a non-serving mobile station that does not use the cell managed by the radio base station as a serving cell. You may be comprised so that the relative transmission rate of data may be calculated.

  A third feature of the present invention is a radio network controller used in a mobile communication system for controlling a transmission rate of uplink user data transmitted by a mobile station via an enhanced dedicated physical data channel, wherein the mobile station Identification of a correspondence table that associates the transmission data block size of the uplink user data with the transmission power ratio of the enhanced dedicated physical data channel and the dedicated physical control channel when setting a data connection for transmitting the uplink user data The gist is that the wireless base station is configured to notify information.

  As described above, according to the present invention, a transmission rate control method capable of measuring the received power of E-DPDCH with high accuracy by a simple method even when the uplink user data pattern is unknown. A radio base station and a radio network controller can be provided.

(Configuration of mobile communication system according to the first embodiment of the present invention)
The configuration of the mobile communication system according to the first embodiment of the present invention will be described with reference to FIG. 1 to FIG. The mobile communication system according to the present embodiment is designed for the purpose of improving communication performance such as communication capacity and communication quality. In addition, the mobile communication system according to the present embodiment is applicable to “W-CDMA” and “CDMA2000” which are third generation mobile communication systems.

  FIG. 1 shows a schematic configuration example of a mobile station UE according to the present embodiment. As shown in FIG. 2, the mobile station UE includes a bus interface unit 11, a call processing control unit 12, a baseband signal processing unit 13, a transmission / reception unit 14, and a transmission / reception antenna 15. Further, the mobile station UE may be configured to include an amplifier unit (not shown).

  However, these configurations do not necessarily have to exist independently as hardware. That is, the components may be combined or may be configured by a software process.

  FIG. 2 shows functional blocks of the baseband signal processing unit 13. As shown in FIG. 3, the baseband signal processing unit 13 includes an upper layer function unit 131, an RLC function unit 132 that functions as an RLC sublayer, a MAC-d function unit 133, a MAC-e function unit 134, 1 and a layer 1 function unit 135 functioning as 1.

  As shown in FIG. 3, the RLC function unit 132 divides application data (RLC SDU) received from the upper layer function unit 131 into a predetermined PDU size, and uses an RLC header used for order rearrangement processing, retransmission processing, and the like. To generate an RLC PDU and pass it to the MAC-d function unit 133.

  Here, a pipe that functions as a bridge between the RLC function unit 132 and the MAC-d function unit 133 is referred to as a “logical channel”. Logical channels are classified according to the contents of data to be transmitted and received, and when performing communication, a single connection can have a plurality of logical channels. That is, a plurality of contents data (for example, control data and user data) can be transmitted and received logically in parallel.

  The MAC-d functional unit 133 generates a MAC-d PDU by multiplexing logical channels and adding a MAC-d header accompanying the multiplexing. A plurality of MAC-d PDUs are transferred from the MAC-d function unit 133 to the MAC-e function unit 134 as a MAC-d flow.

  The MAC-e functional unit 134 generates and generates a transport block by adding a MAC-e header to a plurality of MAC-d PDUs received as a MAC-d flow from the MAC-d functional unit 133. The transport block is passed to the layer 1 function unit 135 via the transport channel.

  The MAC-e function unit 134 functions as a lower layer of the MAC-d function unit 133, and performs a retransmission control function by hybrid ARQ (HARQ) and a transmission rate control function.

  Specifically, as illustrated in FIG. 4, the MAC-e function unit 134 includes a multiplexing unit 134a, an E-TFC selection unit 134b, and a HARQ processing unit 134c.

  The multiplexing unit 134a multiplexes the uplink user data received as the MAC-d flow from the MAC-d function unit 133 based on the E-TFI (Enhanced-Transport Format Indicator) notified from the E-TFC selection unit 134b. It is configured to generate the uplink user data (transport block) to be transmitted through the transport channel (E-DCH) and transmit it to the HARQ processing unit 134c.

  Hereinafter, the uplink user data received as the MAC-d flow is referred to as “uplink user data (MAC-d flow)”, and the uplink user data to be transmitted through the transport channel (E-DCH) is referred to as “uplink user data ( E-DCH) ".

  Here, E-TFI is an identifier of a transport format that is a format for supplying a transport block for each TTI on the transport channel (E-DCH), and is given to the MAC-e header described above. is there.

  Further, the multiplexing unit 134a is configured to determine the transmission data block size applied to the uplink user data based on the E-TFI notified from the E-TFC selection unit 134b and notify the HARQ processing unit 134c. Has been.

  When the multiplexing unit 134a receives uplink user data as a MAC-d flow from the MAC-d function unit 133, the multiplexing unit 134a sets E-TFC selection information for selecting a transport format for the uplink user data as E-TFC selection information. The TFC selection unit 134b is notified.

  Here, the E-TFC selection information corresponds to the data size and priority class of the uplink user data.

  Further, when receiving a call request from the MAC-d function unit 133, the multiplexing unit 134 a is configured to multiplex on the RACH (Random Access Channel) and transmit it to the layer 1 function unit 135. Here, the transmission request is a request for setting a data connection (DCH (Dedicated Channel), E-DPDCH) for the mobile station UE to transmit uplink user data.

  The HARQ processing unit 134c converts the uplink user data (E-DCH) to the uplink user data (E-DCH) based on the ACK / NACK for the uplink user data notified from the layer 1 function unit 135 by the N-channel stop-and-wait (N-SAW) protocol. The retransmission control process is configured to be performed. Here, FIG. 5 shows an operation example of the stop-and-wait protocol of 4 channels.

  Also, the HARQ processing unit 134c transmits the uplink user data (E-DCH) received from the multiplexing unit 134a and HARQ information (for example, retransmission number) used for HARQ processing to the layer 1 function unit 135. It is configured.

  The E-TFC selection unit 134b is configured to determine the transmission rate of the uplink user data by selecting a transport format (E-TF) applied to the uplink user data (E-DCH).

  Specifically, the E-TFC selection unit 134b receives scheduling information (for example, an absolute transmission rate or a relative transmission rate of uplink user data) received from the radio base station NodeB, or a MAC passed from the MAC-d function unit 133. -d Transmission execution or transmission of uplink user data based on the data amount of PDU (data size of uplink user data), the state of hardware resources of the radio base station NodeB managed in the MAC-e function unit 134, etc. The stop is determined, and further, the transport format (E-TF) applied to the transmission of the uplink user data is selected, and the E-TFI for identifying the transport format is designated as the layer 1 function unit 135 and the multiplexing unit. It is comprised so that it may notify to 134a.

  For example, the E-TFC selection unit 134b stores the transmission rate of the uplink user data and the transport format in association with each other, and updates the transmission rate of the uplink user data based on the scheduling information from the layer 1 function unit 135. The layer 1 function unit 135 and the multiplexing unit 134a are then notified of the E-TFI for identifying the transport format associated with the transmission rate of the updated uplink user data.

  Here, when the E-TFC selection unit 134b receives the absolute transmission rate of the uplink user data from the serving cell of the mobile station UE as scheduling information via the E-AGCH, the E-TFC selection unit 134b sets the uplink user data transmission rate to the uplink user data. Change to the absolute transmission rate of user data.

  In addition, when the E-TFC selection unit 134b receives the relative transmission rate (UP command or DOWN command) of uplink user data from the non-serving cell of the mobile station UE as scheduling information via the E-RGCH, Is increased or decreased by a predetermined rate based on a relative transmission rate of the uplink user data.

  In this specification, the transmission rate of the uplink user data may be a rate at which the uplink user data can be transmitted via the E-DPDCH, or the transmission data block size (TBS) for transmitting the uplink user data. It may be the transmission power of E-DPDCH, or the transmission power ratio (transmission power offset) between E-DPDCH and DPCCH (Dedicated Physical Control Channel).

  The E-TFC selection unit 134b is configured to store the HARQ profile. Here, the HARQ profile is a correspondence table that associates the transmission data block size of the uplink user data with the transmission power ratio between the E-DPDCH and the DPCCH (E-DPDCH transmission power ratio, E-DPDCH transmission power offset) ( FIG. 15).

  The E-TFC selection unit 134b may be configured to store a predetermined HARQ profile, or a control connection (DPCCH) for transmitting / receiving control information to / from the radio network controller RNC. It may be configured to store the HARQ profile received via.

  Further, the E-TFC selection unit 134b may store different HARQ profiles for each logical channel or for each higher layer flow (see FIG. 16). In this case, the E-TFC selection unit 134b, when the mobile station UE sets a data connection for transmitting uplink user data, the HARQ profile ID (identification information of the correspondence table) designated by the radio network controller RNC The HARQ profile identified by is used.

  Here, when the HARQ profile is stored separately for each logical channel, the logical channel ID is designated as the HARQ profile ID, and when the HARQ profile is stored separately for each higher layer flow, the HARQ profile ID is The flow ID may be specified.

  The relationship between the uplink user data transmission data block size and the E-DPDCH transmission power ratio in the uplink user data transport format is the relationship between the uplink user data transmission data block size and the E-DPDCH transmission power ratio in the HARQ profile. It is set to satisfy the correspondence.

  As shown in FIG. 6, the layer 1 functional unit 135 includes a transmission channel coding unit 135a, a physical channel mapping unit 135b, an E-DPDCH transmission unit 135c, an E-DPCCH transmission unit 135d, and an E-HICH reception unit. 135e, E-RGCH receiver 135f, E-AGCH receiver 135g, physical channel demapping unit 135h, PRACH transmitter 135i, S-CCPCH receiver 135j, and DPCH receiver 135k Yes.

  As illustrated in FIG. 7, the transmission channel encoding unit 135a includes an FEC (Forward Error Collection) encoding unit 135a1 and a transmission rate matching unit 135a2.

  As shown in FIG. 7, the FEC encoding unit 135a1 performs error correction encoding processing on the uplink user data (E-DCH) transmitted from the MAC-e function unit 134, that is, the transport block. It is configured.

  Further, as shown in FIG. 7, the transmission rate matching unit 135a2 performs “repetition (bit repetition)” or “puncture” for adjusting the transmission capacity of the physical channel to the transport block subjected to the error correction coding process. (Thinning of bits) ".

  The physical channel mapping unit 135b maps the uplink user data (E-DCH) from the transmission channel coding unit 135a to the E-DPDCH, and the E-TFI and HARQ information from the transmission channel coding unit 135a to the E-DPCCH. The transmission request (RACH) from the transmission channel encoding unit 135a is mapped to the PRACH (Physical Random Access Channel).

  The E-DPDCH transmission unit 135c is configured to perform transmission processing for the above-described E-DPDCH, and the E-DPCCH transmission unit 135d is configured to perform transmission processing for the above-described E-DPCCH. Yes.

  It is assumed that E-DPDCH format information (for example, transmission data block size of uplink user data) is mapped to E-DPCCH.

  The PRACH transmission unit 135i is configured to perform transmission processing for the above-described PRACH.

  Further, the PRACH transmission unit 135i performs a transmission process for the PRACH that transmits a control connection setting response notifying that the control connection (DPCCH) for transmitting control information to the mobile station UE is set. It is configured.

  The E-HICH receiving unit 135e is configured to receive an E-HICH (E-DCH HARQ Acknowledgment Indicator Channel) transmitted from the radio base station NodeB.

  The E-RGCH receiving unit 135f is configured to receive the E-RGCH transmitted from the radio base station NodeB (the serving cell and the non-serving cell of the mobile station UE), and the E-AGCH receiving unit 135g It is configured to receive E-AGCH transmitted from NodeB (serving cell of mobile station UE).

  The S-CCPCH receiving unit 135j is configured to receive an S-CCPCH (Secondary Common Control Physical Channel) transmitted from the radio base station NodeB, and the DPCH receiving unit 135k is transmitted from the radio base station NodeB. It is configured to receive DPCH.

  The physical channel demapping unit 135h is configured to extract the ACK / NACK for uplink user data included in the E-HICH received by the E-HICH receiving unit 135e and transmit it to the MAC-e function unit 134. Yes.

  Further, the physical channel demapping unit 135h extracts scheduling information (relative transmission rate of uplink user data, that is, UP command / DOWN command) included in the E-RGCH received by the E-RGCH receiving unit 135f, and extracts the MAC. -e It is comprised so that it may transmit to the function part 134.

  Also, the physical channel demapping unit 135h extracts scheduling information (absolute transmission rate of uplink user data) included in the E-AGCH received by the E-AGCH receiving unit 135g and transmits the extracted scheduling information to the MAC-e function unit 134. It is configured as follows.

  The physical channel demapping unit 135h is configured to extract the HARQ profile ID included in the DPCCH received by the DPCH receiving unit 135k and transmit the HARQ profile ID to the MAC-e function unit 134.

  FIG. 8 is a functional block configuration example of the radio base station NodeB according to the present embodiment. As shown in FIG. 8, the radio base station NodeB according to this embodiment includes an HWY interface 21, a baseband signal processing unit 22, a transmission / reception unit 23, an amplifier unit 24, a call processing control unit 26, and a transmission / reception antenna. 25.

  The HWY interface 21 is configured to receive downlink user data to be transmitted from the radio network controller RNC located above the radio base station NodeB and input the downlink user data to the baseband signal processing unit 22. The HWY interface 21 is configured to transmit the uplink user data from the baseband signal processing unit 22 to the radio network controller RNC.

  The baseband signal processing unit 22 is configured to transmit baseband signals including the downlink user data to the transmission / reception unit 23 after performing layer 1 processing such as channel coding processing and spreading processing on the downlink user data. Has been.

  In addition, the baseband signal processing unit 22 performs layer 1 processing such as despreading processing, RAKE combining processing, and error correction decoding processing on the baseband signal from the baseband signal processing unit 22, and then acquires The uplink user data is transmitted to the HWY interface 21.

  The transmission / reception unit 23 is configured to convert the baseband signal from the baseband signal processing unit 22 into a radio frequency band signal. The transmission / reception unit 23 is configured to convert the radio frequency band signal from the amplifier unit 24 into a baseband signal.

  The amplifier unit 24 is configured to amplify the radio frequency band signal from the transmission / reception unit 23 and transmit it via the transmission / reception antenna 25. The amplifier unit 24 is configured to amplify a signal received by the transmission / reception antenna 25 and transmit the amplified signal to the transmission / reception unit 23.

  The call processing control unit 26 transmits / receives a call processing control signal to / from the radio network controller RNC, performs state management of each functional unit of the radio base station NodeB, processing such as hardware resource allocation by layer 3 and the like. Is configured to do.

  FIG. 9 is a functional block diagram of the baseband signal processing unit 22. As shown in FIG. 10, the baseband signal processing unit 22 includes a layer 1 function unit 221 and a MAC-e function unit 222.

  As shown in FIG. 10, the layer 1 function unit 221 includes an E-DPCCH despreading / RAKE combining unit 221a, an E-DPCCH decoding unit 221b, an E-DPDCH despreading / RAKE combining unit 221c, a buffer 221d, Re-spreading section 221e, HARQ buffer 221f, error correction decoding section 221g, transmission channel encoding section 221h, physical mapping section 221i, E-HICH transmitting section 221j, E-AGCH transmitting section 221k, E -RGCH transmission section 221l, PRACH despreading / RAKE combining section 221m, PRACH decoding section 221n, S-CCPCH transmission section 221o, DPCH transmission section 221p, and DPCCH received power measurement section 221q.

  Note that these configurations do not necessarily have to exist independently as hardware. That is, the components may be combined or may be configured by a software process.

  The E-DPCCH despreading / RAKE unit 221a is configured to perform despreading processing and RAKE combining processing on the E-DPCCH.

  The E-DPCCH decoding unit 221b uses an E-TFCI (or E-TFRI: Enhanced Transport Format and Resource) for determining the transmission rate of uplink user data based on the output from the E-DPCCH despreading / RAKE unit 221a. (Indicator) is decoded and transmitted to the MAC-e function unit 22c.

  Specifically, the E-DPCCH decoding unit 221b extracts the transmission data block size (TBS) of the uplink user data from the E-DPCCH transmitted from the mobile station, and notifies the MAC-e function unit 22c of it. It is configured.

  The E-DPDCH despreading / RAKE combining unit 221c performs despreading processing on the E-DPDCH using the spreading factor (minimum spreading factor) corresponding to the highest rate that the E-DPDCH can take and the number of multicodes. And is configured to accumulate in the buffer 221d. By performing the despreading process using the spreading factor and the number of multicodes, it is possible to secure resources so that the mobile station UE can receive up to the maximum rate (bit rate) that can be taken.

  The re-despreading unit 221e performs re-despreading processing on the data stored in the buffer 221d using the spreading factor and the number of multicodes notified from the MAC-e function unit 222, and stores the data in the HARQ buffer 221f. It is configured to accumulate.

  Based on the encoding rate notified from the MAC-e function unit 222, the error correction decoding unit 221g performs uplink user data (E) obtained by performing error correction decoding processing on the data stored in the buffer 221d. -DCH) is transmitted to the MAC-e function unit 222.

  The PRACH despreading / RAKE combining unit 221m is configured to perform a despreading process and a RAKE combining process on the PRACH. Further, the PRACH decoding unit 221n decodes the transmission request or control connection setting response transmitted from the mobile station UE based on the output from the PRACH despreading / RAKE combining unit 221m, and performs the MAC-e function via the RACH. It is comprised so that it may transmit to the part 22c.

  The transmission channel coding unit 221h is configured to perform necessary coding processing on ACK / NACK and scheduling information for uplink user data received from the MAC-e function unit 222.

  The physical channel mapping unit 221i maps the ACK / NACK for uplink user data from the transmission channel encoding unit 221h to E-HICH, and the scheduling information (absolute transmission rate) from the transmission channel encoding unit 221h is E-AGCH. And the scheduling information (relative transmission rate) from the transmission channel encoding unit 221h is mapped to the E-RGCH.

  In addition, the physical channel mapping unit 221i is configured to map a control connection setting request for requesting setting of a control connection for transmitting control information to the mobile station UE to the S-CCPCH.

  The physical channel mapping unit 221i is configured to map a logical control channel for notifying the mobile station UE of the HARQ profile ID and the like to the DPDCH.

  The E-HICH transmission unit 221j is configured to perform transmission processing for the above-described E-HICH, and the E-AGCH transmission unit 221k is configured to perform transmission processing for the above-described E-AGCH. The E-RGCH transmission unit 221l is configured to perform transmission processing for the above-described E-RGCH.

  The S-CCPCH transmission unit 221o is configured to perform transmission processing for the above-described S-CCPCH, and the DPCH transmission unit 221p is configured to perform transmission processing for the above-described DPCH.

  The DPCCH reception power measurement unit 221q is configured to measure the reception power of the received DPCCH and notify the MAC-e function unit 222 of the measurement result.

  As shown in FIG. 11, the MAC-e function unit 222 includes a HARQ processing unit 222a, a reception processing command unit 222b, a scheduling unit 222c, a demultiplexing unit 222d, and a multiplexing unit 222e. .

  The HARQ processing unit 222a is configured to receive the uplink user data (E-DCH) and HARQ information received from the layer 1 function unit 221 and perform HARQ processing on the uplink user data (E-DCH). Yes.

  Further, the HARQ processing unit 222a is configured to notify the layer 1 function unit 221 of ACK / NACK (for uplink user data) indicating the reception processing result for the uplink user data (E-DCH). Moreover, the HARQ processing unit 222a is configured to notify the scheduling unit 222c of ACK / NACK (for uplink user data) for each process.

  The reception processing command unit 222b re-reads the spreading factor and the number of multicodes related to the transport format of each mobile station UE specified by the E-TFCI for each TTI received from the E-DPCCH decoding unit 221b of the layer 1 function unit 221. The despreading unit 221e and the HARQ buffer 221f are notified, and the coding rate is notified to the error correction decoding unit 221g.

  The scheduling unit 222c is based on E-TFCI for each TTI received from the E-DPCCH decoding unit 221b of the layer 1 function unit 221, ACK / NACK for each process received from the HARQ processing unit 222a, an interference level, and the like. The absolute transmission rate or the relative transmission rate of the above-described uplink user data is changed.

  Further, the scheduling unit 222c is configured to store one or a plurality of HARQ profiles similarly to the E-TFC selection unit 134b in the mobile station UE.

  Also, the scheduling unit 222c refers to the stored HARQ profile and is associated with the transmission data block size of the uplink user data (extracted by the E-DPCCH decoding unit 221b) transmitted from the layer 1 function unit 222. The E-DPDCH transmission power ratio is acquired.

  When a plurality of HARQ profiles are stored, the scheduling unit 222c refers to the HARQ identified by the HARQ profile ID notified by the radio network controller RNC so as to obtain the above-described E-DPDCH transmission power ratio It is configured.

  The scheduling unit 222c is configured to calculate the received power of the E-DPDCH based on the measured received power of the DPCCH and the acquired E-DPDCH transmission power ratio.

  The scheduling unit 222c is configured to calculate the relative transmission rate of the uplink user data based on the calculated received power of the E-DPDCH.

  Specifically, the scheduling unit 222c is managed by the radio base station NodeB and the integrated value of the received power of the E-DPDCH transmitted from the serving mobile station having the cell managed by the radio base station NodeB as the serving cell. The relative transmission rate of the uplink user data is calculated on the basis of the result of comparison with the integrated value of the received power of the E-DPDCH transmitted from a non-serving mobile station that is not serving as a serving cell.

  The scheduling unit 222c is configured to notify the layer 1 function unit 221 of the uplink user data absolute transmission rate or relative transmission rate as scheduling information via the DCH.

  The demultiplexing unit 222d is configured to transmit the uplink user data acquired by performing the demultiplexing process on the uplink user data (E-DCH) received from the HARQ processing unit 222a to the HWY interface 21. Yes.

  Further, the demultiplexing unit 222d obtains the result obtained by performing demultiplexing processing on the transmission request (RACH) and control connection setting response (RACH) received from the layer 1 function unit 221, and obtains the result as the HWY interface. It is comprised so that it may transmit to 21.

  The multiplexing unit 222e is configured to multiplex the control connection setting request received from the radio network controller RNC via the HWY interface 21 on the FACH (Forward Access Channel) and transmit it to the layer 1 function unit 221. .

  The multiplexing unit 222e is configured to multiplex the HARQ profile ID received from the radio network controller RNC via the HWY interface 21 on the DCH and transmit it to the layer 1 function unit 221.

  The radio network controller RNC according to the present embodiment is an apparatus positioned above the radio base station NodeB, and is configured to control radio communication between the radio base station NodeB and the mobile station UE.

  As shown in FIG. 12, the radio network controller RNC according to the present embodiment includes an exchange interface 31, an LLC layer processing unit 32, a MAC layer processing unit 33, a media signal processing unit 34, and a radio base station interface. 35 and a call processing control unit 36.

  The switching center interface 31 is an interface with the switching center 1. The switching center interface 31 is configured to transfer the downlink signal transmitted from the switching center 1 to the LLC layer processing unit 32 and transfer the uplink signal transmitted from the LLC layer processing unit 32 to the switching center 1. Yes.

  The LLC layer processing unit 32 is configured to perform LLC (Logical Link Control) sublayer processing such as header or trailer combining processing such as sequence pattern numbers. The LLC layer processing unit 32 is configured to transmit the uplink signal to the exchange interface 31 and transmit the downlink signal to the MAC layer processing unit 33 after performing the LLC sublayer processing.

  The MAC layer processing unit 33 is configured to perform MAC layer processing such as priority control processing and header addition processing. After performing the MAC layer processing, the MAC layer processing unit 33 transmits the uplink signal to the LLC layer processing unit 32 and transmits the downlink signal to the radio base station interface 35 (or the media signal processing unit 34). Is configured to do.

  The media signal processing unit 34 is configured to perform media signal processing on audio signals and real-time image signals. After performing media signal processing, the media signal processing unit 34 is configured to transmit uplink signals to the MAC layer processing unit 33 and transmit downlink signals to the radio base station interface 35.

  The radio base station interface 35 is an interface with the radio base station NodeB. The radio base station interface 35 transfers the uplink signal transmitted from the radio base station NodeB to the MAC layer processing unit 33 (or media signal processing unit 34), and the MAC layer processing unit 33 (or media signal processing unit 34). ) Is transmitted to the radio base station NodeB.

  The call processing control unit 36 is configured to perform radio resource management processing, channel setting and release processing by layer 3 signaling, and the like. Here, the radio resource management includes call admission control, handover control, and the like.

  In addition, when the mobile station UE sets up a data connection (DCH, E-DPDCH) for transmitting uplink user data, the call processing control unit 36 transmits the HARQ profile to the mobile station UE and the radio base station NodeB. You may be comprised so that ID may be notified.

  Further, when only one HARQ profile exists, the call processing control unit 36 sets the HARQ profile ID when the mobile station UE sets a data connection (DCH, E-DPDCH) for transmitting uplink user data. May not be notified.

(Operation of the mobile communication system according to the first embodiment of the present invention)
Hereinafter, the operation of the mobile communication system according to the present embodiment will be described with reference to FIGS. 13 to 18.

  First, a cell setting operation in the mobile communication system according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 13, in step S1001, the radio network controller RNC makes a cell setting request when the radio base station NodeB is started up or when a parameter to be set in the radio base station NodeB is changed. Is transmitted to the radio base station NodeB.

  By this cell setting request, for example, the target value of the ratio of the received power of E-DPDCH from the serving mobile station and the received power of E-DPDCH from the non-serving mobile station is notified.

  In step S1002, the radio base station NodeB transmits a cell setting response for notifying that the parameter notified by the cell setting request is set to the radio network controller RNC.

  Secondly, a data connection setting operation in the mobile communication system according to the present embodiment will be described with reference to FIG.

  As illustrated in FIG. 14, in step S2001, the mobile station UE transmits a call request for requesting setting of a data connection for the mobile station UE to transmit uplink user data, using PRACH (RACH).

  In step S2002, the radio network controller RNC makes a connection setting request for requesting the radio base station NodeB that manages the serving cell of the mobile station UE to set the data connection in response to the received call request. Send.

  In step S2003, when the radio base station NodeB determines that the above-described data connection can be set between the mobile station UE and the radio base station NodeB, a radio network controller sends a connection setting response indicating that fact. Send to RNC.

  In step S2004, the radio network controller RNC uses the S-CCPCH (FACH) to transmit control information (for example, HARQ profile ID) to the mobile station UE. A control connection setting request for requesting setting of a control connection (DCH, DPCCH) is transmitted.

  In step S2005, the mobile station UE transmits a control connection setting response for notifying that the above-described control connection is set to the radio network controller RNC using PRACH (RACH).

  In step S2006, the above-described data connection is set through the control connection.

  Here, when a plurality of HARQ profiles are stored in the mobile station UE and the radio base station NodeB, the radio network controller RNC notifies the mobile station UE and the radio base station NodeB of the HARQ profile ID.

  As a result, the HARQ profile specified by the notified HARQ profile ID is used in an uplink user data transmission rate control operation to be described later.

  On the other hand, when only one HARQ profile is stored in the mobile station UE and the radio base station NodeB, the radio network controller RNC needs to notify the mobile station UE and the radio base station NodeB of the HARQ profile. No.

  Third, with reference to FIG. 17 and FIG. 18, the transmission rate control operation of the uplink user data in the mobile communication system according to this embodiment will be described.

  As illustrated in FIG. 17, in step S201, the radio base station NodeB causes each mobile station with which the radio base station NodeB has established a radio link, that is, the radio base station NodeB to receive the E-DPDCH. The E-DPDCH received power from each of the mobile stations set to is estimated. With reference to FIG. 18, the operation for estimating the received power of E-DPDCH from each mobile station UE will be described.

  As shown in FIG. 18, in step S101, the radio base station NodeB measures the received power of the DPCCH transmitted from the mobile station UE.

  In step S102, the radio base station NodeB decodes the E-DPCCH transmitted from the mobile station UE, and extracts the transmission data block size (TBS) of the uplink user data from the decoded E-DPCCH.

  In step S103, the radio base station NodeB refers to the HARQ profile specified by the HARQ profile ID notified by the radio network controller RNC in step S2006, and is associated with the transmission data block size of the extracted uplink user data. E-DPDCH transmission power ratio is acquired.

  In step S104, the radio base station NodeB calculates the received power of the E-DPDCH based on the measured received power of the DPCCH and the acquired E-DPDCH transmission power ratio. Specifically, the radio base station NodeB estimates the multiplication result of the measured DPCCH reception power and the acquired E-DPDCH transmission power ratio as the E-DPDCH reception power.

  Returning to FIG. 17, in step S202, the radio base station NodeB, the integrated value of the received power of E-DPDCH transmitted from the serving mobile station of the radio base station NodeB, and the non-serving movement of the radio base station NodeB An integrated value of received power of E-DPDCH transmitted from the station is calculated.

  In step S203, the radio base station NodeB receives the integrated value of the received power of the E-DPDCH transmitted from the serving mobile station of the radio base station NodeB and the E-transmitted from the non-serving mobile station of the radio base station NodeB. The integrated value of the received power of DPDCH is compared.

  Specifically, the radio base station NodeB determines the ratio between the integrated value of the received power of E-DPDCH from the serving mobile station and the integrated value of the received power of E-DPDCH from the non-serving mobile station (serving mobile station received power). It is determined whether or not the ratio of received power to non-serving mobile station is smaller than the target value notified from the radio network controller RNC in step S1001.

  If it is determined that the value is smaller, the operation proceeds to step S204, and otherwise, the operation ends.

  In step S204, the radio base station NodeB calculates the relative transmission rate of the uplink user data based on the received power of the E-DPDCH calculated by the operation of FIG.

  That is, in step S204, the radio base station NodeB generates a “DOWN command” as the relative transmission rate of the uplink user data, and notifies the mobile station UE of the DOWN command via the E-RGCH.

  Here, the mobile station UE controls the transmission speed of the uplink user data based on the notified “DOWN command (relative transmission speed of the uplink user data)”.

(Operations and effects of the mobile communication system according to the first embodiment of the present invention)
According to the mobile communication system according to the present embodiment, the radio base station NodeB can estimate the received power of the E-DPDCH based on the HARQ profile and the measured received power of the DPCCH. Even in a state where is unknown, the received power of E-DPDCH can be measured with high accuracy by a simple method.

  Also, according to the mobile communication system according to the present embodiment, when only one HARQ profile is stored in the radio base station NodeB, the radio network controller RNC transmits the HARQ profile ID to the radio base station NodeB. Therefore, it is possible to reduce the amount of communication between the radio network base station RNC and the radio base station NodeB.

  Further, according to the mobile communication system according to the present embodiment, even when a plurality of HARQ profiles are stored in the radio base station NodeB, the radio network controller RNC performs HARQ on the radio base station NodeB. Since only the profile ID needs to be transmitted, it is possible to reduce the amount of communication between the radio network base station RNC and the radio base station NodeB.

  Although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The apparatus of the present invention can be implemented as a modified or changed mode without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present application is for illustrative purposes and does not have any limiting meaning to the present invention.

FIG. 3 is a functional block diagram of a mobile station according to the first embodiment of the present invention. FIG. 3 is a functional block diagram of a baseband signal processing unit of the mobile station according to the first embodiment of the present invention. It is a figure for demonstrating the function of the baseband signal processing part of the mobile station which concerns on the 1st Embodiment of this invention. 3 is a functional block diagram of a MAC-e function unit in the baseband signal processing unit of the mobile station according to the first embodiment of the present invention. FIG. It is a figure which shows the operation example of the stop and wait protocol of 4 channels performed by the HARQ process part of the MAC-e function part in the baseband signal process part of the mobile station which concerns on the 1st Embodiment of this invention. It is a functional block diagram of the layer 1 function part in the baseband signal processing part of the mobile station which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the function of the layer 1 function part in the baseband signal processing part of the mobile station which concerns on the 1st Embodiment of this invention. FIG. 3 is a functional block diagram of a radio base station according to the first embodiment of the present invention. It is a functional block diagram of the baseband signal processing part of the wireless base station which concerns on the 1st Embodiment of this invention. It is a functional block diagram of the layer 1 function part in the baseband signal processing part of the wireless base station which concerns on the 1st Embodiment of this invention. It is a functional block diagram of the MAC-e function part in the baseband signal processing part of the wireless base station which concerns on the 1st Embodiment of this invention. 2 is a functional block diagram of a radio network controller according to the first embodiment of the present invention. FIG. FIG. 5 is a sequence diagram showing a cell setting operation in the mobile communication system according to the first embodiment of the present invention. FIG. 3 is a sequence diagram showing a data connection setting operation in the mobile communication system according to the first embodiment of the present invention. It is a figure which shows an example of the HARQ profile used with the mobile communication system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the HARQ profile used with the mobile communication system which concerns on the 1st Embodiment of this invention. 4 is a flowchart showing an operation of controlling transmission power of uplink user data in the mobile communication system according to the first embodiment of the present invention. 5 is a flowchart showing an operation in which the radio base station estimates E-DPDCH received power in the mobile communication system according to the first embodiment of the present invention. 1 is an overall configuration diagram of a general mobile communication system. It is a figure for demonstrating the method to control the transmission rate of uplink user data in the mobile communication system which concerns on a prior art. It is a whole block diagram of the mobile communication system which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Switching center, UE ... Mobile station, 11 ... Bus interface, 12 ... Call processing control part, 13 ... Baseband signal processing part, 131 ... Upper layer function part, 132 ... RLC function part, 133 ... MAC-d function part 134 ... MAC-e functional unit, 134a ... multiplexing unit, 134b ... E-TFC selection unit, 134c ... HARQ processing unit, 135 ... layer 1 functional unit, 135a ... transmission channel coding unit, 135b ... physical channel mapping unit, 135c ... E-DPDCH transmitter, 135d ... E-DPCCH transmitter, 135e ... E-HICH receiver, 135f ... E-RGCH receiver, 135g ... E-AGCH receiver, 135h ... physical channel demapping unit, 135i ... PRACH transmission unit, 135j... S-CCPCH reception unit, 135k... DPCH reception unit, 14. NA, NodeB ... radio base station, 21 ... HWY interface, 22 ... baseband signal processing unit, 221 ... layer 1 function unit, 221a ... E-DPCCH despreading / RAKE combining unit, 221b ... E-DPCCH decoding unit, 221c ... E-DPDCH despreading / RAKE combining unit, 221d ... buffer, 221e ... re-despreading unit, 221f ... HARQ buffer, 221g ... error correction decoding unit, 221h ... transmission channel coding unit, 221i ... physical channel mapping unit, 221j ... E-HICH transmission unit, 221k ... E-AGCH transmission unit, 221l ... E-RGCH transmission unit, 221m ... PRACH despreading / RAKE combining unit, 221n ... PRACH decoding unit, 221o ... S-CCPCH transmission unit, 221p ... DPCH transmission , 221q... DPCH received power measurement unit, 222... MAC-e Function unit 222a ... HARQ processing unit 222b ... reception processing command unit 222c ... scheduling unit 222d ... demultiplexing unit 222e ... multiplexing unit 23 ... transmission / reception unit 24 ... amplifier unit 25 ... transmission / reception antenna 26 ... Call processing control unit, RNC ... Radio network control station, 31 ... Switching station interface, 32 ... LLC layer function unit, 33 ... MAC layer function unit, 34 ... Media signal processing unit, 35 ... Radio base station interface, 36 ... Call Processing control unit

Claims (8)

A transmission rate control method for controlling the transmission rate of uplink user data transmitted by a mobile station via an enhanced dedicated physical data channel,
A radio base station measuring received power of a dedicated physical control channel transmitted from the mobile station;
The radio base station extracting a transmission data block size of the uplink user data from an enhanced dedicated physical control channel transmitted from the mobile station;
The radio base station refers to the correspondence table associating the transmission data block size of the uplink user data with the transmission power ratio between the enhanced dedicated physical data channel and the dedicated physical control channel, and extracts the transmitted data block size Obtaining a transmission power ratio between the enhanced dedicated physical data channel and the dedicated physical control channel associated with
The wireless base station has a step of calculating the received power of the enhanced dedicated physical data channel based on the measured received power of the dedicated physical control channel and the acquired transmission power ratio. Transmission speed control method. The wireless base station calculates a relative transmission rate of the uplink user data based on the calculated received power of the enhanced dedicated physical data channel; and
The radio base station notifying the mobile station of the relative transmission rate of the uplink user data via a relative rate control channel;
2. The transmission rate control method according to claim 1, further comprising: controlling the transmission rate of the uplink user data based on the notified relative transmission rate of the uplink user data. 3. In the step of calculating the relative transmission rate of the uplink user data,
The radio base station includes an integrated value of received power of the enhanced dedicated physical data channel transmitted from a serving mobile station having a cell managed by the radio base station as a serving cell, and a cell managed by the radio base station When the ratio of the received power of the enhanced dedicated physical data channel transmitted from a non-serving mobile station that does not serve as a serving cell is smaller than a target value, the uplink is instructed to reduce the transmission rate of the uplink user data. The transmission rate control method according to claim 2 , wherein a relative transmission rate of user data is calculated. The radio base station stores a plurality of correspondence tables associating the transmission data block size with a transmission power ratio between the enhanced dedicated physical data channel and the dedicated physical control channel,
The radio network controller notifies the radio base station of identification information of the correspondence table when the mobile station sets up a data connection for transmitting the uplink user data,
In the step of acquiring the transmission power ratio, the radio base station refers to the correspondence table identified by the notified identification information, and the enhanced individual physical data associated with the extracted transmission data block size The transmission rate control method according to claim 1, wherein a transmission power ratio between a channel and the dedicated physical control channel is acquired. A radio base station used in a mobile communication system for controlling a transmission rate of uplink user data transmitted by a mobile station via an enhanced dedicated physical data channel,
A measurement unit for measuring the received power of the dedicated physical control channel transmitted from the mobile station;
A transmission data block size extraction unit that extracts a transmission data block size of the uplink user data from an enhanced dedicated physical control channel transmitted from the mobile station;
The transmission data block size associated with the extracted transmission data block size with reference to the correspondence table associating the transmission data block size of the uplink user data with the transmission power ratio of the enhanced dedicated physical data channel and the dedicated physical control channel A transmission power ratio acquisition unit for acquiring a transmission power ratio between the enhanced dedicated physical data channel and the dedicated physical control channel;
An enhanced dedicated physical data channel received power calculation unit for calculating the received power of the enhanced dedicated physical data channel based on the measured received power of the dedicated physical control channel and the acquired transmission power ratio. A featured radio base station. An uplink user data relative transmission rate calculation unit for calculating a relative transmission rate of the uplink user data based on the calculated received power of the enhanced dedicated physical data channel;
6. The radio base station according to claim 5, further comprising a relative rate control channel transmission unit that notifies the mobile station of a relative transmission rate of the uplink user data via a relative rate control channel. The uplink user data relative transmission rate calculation unit is configured to calculate an integrated value of received power of the enhanced dedicated physical data channel transmitted from a serving mobile station having a cell managed by the radio base station as a serving cell, and the radio base station. Decrease in the transmission rate of the uplink user data when the ratio of the received power of the enhanced dedicated physical data channel transmitted from a non-serving mobile station that does not use the managed cell as a serving cell is smaller than a target value The radio base station according to claim 6 , wherein the radio base station is configured to calculate a relative transmission rate of the uplink user data instructing the user. A radio network controller used in a mobile communication system for controlling the transmission rate of uplink user data transmitted by a mobile station via an enhanced dedicated physical data channel,
When the mobile station sets up a data connection for transmitting the uplink user data, the transmission data block size of the uplink user data and the transmission power ratio between the enhanced dedicated physical data channel and the dedicated physical control channel It is configured to notify the wireless base station of the identification information of the correspondence table to be associated ,
The radio network controller according to claim 1, wherein the correspondence table specified by the identification information is used in the radio base station to calculate reception power of the enhanced dedicated physical data channel .

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